<template>
  <ul class="app-header-nav">
    <li class="home">
      <RouterLink to="/">首页</RouterLink>
    </li>
    <li v-for="item in list" :key="item.id" @mousemove="show(item)" @mouseleave="hide(item)">
      <RouterLink :to="`/category/${item.id}`" @click="hide(item)">{{ item.name }}</RouterLink>
      <div class="layer" :class="{open: item.open}">
        <ul>
          <li v-for="sub in item.children" :key="sub.id">
            <RouterLink :to="`/category/sub/${sub.id}`" @click="hide(item)">
              <img :src="sub.picture" alt="" >
              <p>{{ sub.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
    </li>
  </ul>
</template>

<script>
import { useStore } from 'vuex'
import { computed } from 'vue'

export default {
  name: 'app-header-nav',
  setup () {
    const store = useStore()
    // 拿到vux中的分类数据
    const list = computed(() => {
      return store.state.category.list
    })
    // 跳转的时候不会关闭二级类目，通过数据来控制
    // 1.每个分类加上open数据
    // 2.提供显示和隐藏函数，修改open数据
    // 3.在组件中使用vuex中的函数，使用时间来绑定，提供一个类名来显示隐藏的类名
    const show = (item) => {
      store.commit('category/show', item.id)
    }
    const hide = (item) => {
      store.commit('category/hide', item.id)
    }
    return {
      list,
      show,
      hide
    }
  }
}
</script>

<style scoped lang="less">
.app-header-nav {
  width: 820px;
  display: flex;
  justify-content: space-around;
  padding-left: 40px;
  position: relative;

  > li {
    margin-right: 40px;
    width: 38px;
    text-align: center;
    > a {
      font-size: 16px;
      line-height: 32px;
      height: 32px;
      display: inline-block;
    }

    &:hover {
      //a {
        color: @xtxColor;
        border-bottom: 1px solid @xtxColor;
      //}

      //  显示二级类目
      //> .layer {
      //  height: 132px;
      //  opacity: 1;
      //}
    }
  }
  // 二级类名弹出层
  .layer {
    &.open {
      height: 132px;
      opacity: 1;
      z-index: 9999;
    }
    width: 1240px;
    background-color: #fff;
    position: absolute;
    left: -200px;
    top: 56px;
    height: 0;
    overflow: hidden;
    opacity: 0;
    box-shadow: 0 0 5px #ccc;
    transition: all .2s .1s;

    ul {
      display: flex;
      flex-wrap: wrap;
      padding: 0 70px;
      align-items: center;
      height: 132px;

      li {
        width: 110px;
        text-align: center;

        img {
          width: 60px;
          height: 60px;
        }

        p {
          padding-top: 10px;
        }

        &:hover {
          p {
            color: @xtxColor;
          }
        }
      }
    }
  }
}
</style>
